Cotton-dyestuffs.



. w L/ o UNITED STATES iygnn'r OFFICE.

AUGUST BLANK, CARL HEIDEN BEICH. AND JOHANNES JANSEN, 0F LEVERKUSEN,

NEAR COLOGNE, GERMANY, ASSIGNORS TO FARBENFABRIKEN VORM. IiIRZIZEDIIA BAYER & 00., 0F ELBERFELD', GERMANY, A CORPORATION OF GERMANY.

co'r'roN-nYnsrUrFs.

No Drawing.

To all whom it m ay concern Be it known that we, AUGUsT-BLANK, CARL HEIDENREIGH, and J OHANNES J ANSEN, doctors of philosophy, chemists, citizens of the German Empire, residing at Leverkusen, near Cologne-on-the-Rhine, Germany, have invented new and useful Improvements in Cotton-Dyestuffs, of which the following is a specification.

We have found that new and valuable cotton dyes can be obtained by combining two molecules of a diazotized acidyldiamin with one molecule of the urea of 2.5.7- aminonaphthol sulfonic acid of the formula:

H OH

' splitting off the acidyl radicals tetrazotizing and coupling the resulting tetrazo compounds with an azo dyestuff component, such as resorcin, a meta-dlamln, metaaminophenol or their derivatives.

Other diamins, e. g. formyl-2A-to1uy1enediamin, 'iormyl-QA-diaminoanisol, paraaminoacetanilid, 2 oxalylamino 5 aminopara-xylol, 2-amino-5acetylaminotoluene, 2- oxalylamino 4 methyl 5 amino-anisol, acidyl-1.4-naphthylenediamin 6 sulfonic acid etc., Instead of resorcin other com- 'with a violet-red coloration.

In order to illustrate the new process more fully the following example is given, the parts being by weight- 272 parts of meta-aminoformanilid are diazotized with 60 parts of concentrated hydrochloric acid and 13.8 parts of nitrite. The diazo solution is then added to a solution of 54.8 arts of the urea of 2.5.7-aminonaphthol-sul onic acid (sodium salt) in 2000 parts of water and 40 parts of calcined soda. The mixture is stirred during 12 hours, heated to 90 .C. and kept at this temperature during half an hour after the addition of 150 parts of sulfuric acid (40 B.). Subsequently the mixture is allowed to cool to 60 C. and the dye is salted out and filtered off. It is then stirred up with 2000 parts of water, rendered slightly alkaline with caustic soda lye, cooled to 10 0., acidulated with 60 parts of-hydrochloric acid and 13.8 parts of sodium nitrite and stirred during 6 hours.

Patented Feb. 17, 1914.

The mixture thus obtained is then intro duced into a solution cooled to zero of 29, parts of resorcin in 1000 parts of water containing parts of calcined sodium carbonate. The mixture is heated to 60-7 0 C. and the dye is salted out andfiltered oif. It is after being dried and pulverized inthe shape of its sodium salt a brown powder soluble in water with a red coloration, soluble in concentrated sulfuric acid (66 Be.) Upon treatment with stannous chlorid and h drochloric acid it is split up, the urea 0 21? diamino-5-naphth0l-7;sulfonic acid, meta-- phenylenediamin and aminoresorcin are ob tained. It dyes cotton yellowish-red and has in a free state most probably the formula: I

ponents, such as meta-phenylenediamin, meta-aminophenol etc. can be used.

We claim 1. The herein described new tetrakisazo dyestufis derived from the urea of 2.5.7- aminonaphthol-sulfonic acid, aromatic diamin and an azo-dyestufi component, which dyes are after being dried and in the shape of their alkaline salts brownish powders soluble in Water and in coneentrated sulfuric acid generally with a red to reddish-Violet coloration; yielding upon re 2. The herein described new tetrakisazo duction Wit-h stannous chlorid and hydrodyestuff having in a free state most probchloric acid the urea of 2.6-diamino-5-naphi ably the formula:

thol-7-sulfonic acid, a diamin and an amin; J

pulverized and dyeing cotton from red to blue bright shades Winch are rendered :iast to Washing by an aftertreatnient With formaldehyde, I substantially as described.

In testimony whereof We have hereunto set our hands in the presence of two subscribing Witnesses.

AUGUST BLANK. n s.]

CARL HEIDENREIGH. [L 5. JOHANNES JANSEN. 11. 8.]

chloric acid the urea of 2.6-dia1nino-5-naphthol-7-sulf0nic acid, ineta-phenylenediamin lowish-red shades, rendered fast to Washing i treatment with stannous chlorid and hydrol l l l Witnesses I'IELEN Norm, DORA NUFER.

and aminoresorcin; and dyeing cotton yelhy an after-treatment with formaldehyde, substantially as described. 

